<option> tag defines an option in a select (a.k.a dropdown) list, which is part of a form. The visible text is printed between the
<option value="ranks">Webmaster Software</option>Webmaster Software will be indexed, ranks will not be. The
<option>tag supports the title attribute for user agents.
<optgroup label="Ranks Software">Additional information for users can be provided using the title attribute. Text within the label attribute might be indexed by search engines since it provides a clear semantic relationship with the option tag that will follow optgroup